When spectators watch me fly.  They really enjoy the live feed on my phone.  Wouldn't it  be "cool?" to tell them to download a "spectator app"  (with no controls or details.....just video)  so they could watch without looking over my back yet see what I'm seeing.   Just an Idea.....

You can try screen mirroring. That'll do it.

I've used a Miracast from the tablet I use to fly with to a LED monitor.  Miracast from cell phones, your mileage may vary, I've had some with good quality and some not so good.